i have to 的用法

首先记住：have
to
do
sth
是实意动词或行为动词。
I
have
to
do
the
housework
every
day.
I
had
to...
I
don't
have
to
do
the
housework
every
day.
I
didn't
have
to...
Do
you
have
to
do
the
housework
every
day.
Did
you
have
to...?
Yes,
I
do.
Yes,
I
did.
No.
I
don't.
No,
I
didn't.
另一种情形是作为
---Must...?
的否定应答之一：
---Must
I
hand
in
my
homework
right
now?
---
Yes,
you
must.
---No,
you
needn't
=
you
don't
have
to.
You
may
hand
it
in
this
afternoon
.